Tool for working tubing



Feb. 14,1939. G. w. HAURY 2,147,032

' 7 Q I TOOL FOR WORKING TUBING Filed on. e, 1936 nvmvroa A TTQRNEYS.

Patented Feb. 14, 1939 um'rco STATES PATENT. o icE TOOL FOR- WORKINGGeorge W. Haury, Chicago, 11]., assignor to The perial cago, Ill.

Brass Manufacturing Company, Chb

Application mmc, 1930; semi No. 104,255

improved tool for working tubing which will form a groove of apredetermined depth in the tubing.

A further object is to provide a new and improved tool for workingtubing which will simull taneously cut and groove tubing, the groovebeing formed at a predetermined distance from the end and of a limiteddepth.

Further objects and advantages of myinvention will become apparent asthe description pro- 20 ceeds, taken in connection with the accompanyingdrawing which forms a part of this specification. I

Fig. 1 is a top view of my tool. Fig. 2 is a side view. 26 Fig. 3 showsa section and Fig. 4 a side view of a tube after working.

Fig. 5 and Fig. 6 show views of the disc.

While I have shown in the drawing and shall herein describe in detailthe preferred embodi- -30 ment of my invention, it is to be understoodthat I do not thereby intend to limit the invention to the specific formdisclosed, but aim to cover all the modifications and alternativeconstructions falling within the spirit and scopeof the append- 35edclaim. v

A body I is shown having mounted thereon a carriage 2 driven by a screw3. A tube 4 is the subject of the work and a handle 5 is used forturning the screw to drive the carriage to and 40 away from the work. I

The body is constructed with an open central portion 6 at one end ofwhich is a V shaped recase I in the projection 8 for holding the tube.

At the opposite end another projection 9 is sore 45 threadedto'accommodate the screw 3.

There is a sliding contact between the carriage 2 and the body, thecarriage beingequipped with 9. depending shoulder in on each side toguide it laterally along the portion 6 of the body and 50 maintain it inperfect cutting alignment during operation. At the left the carriage hasa hole II to accommodate the screw 8 which is constructed with anannular recess l2 near the end. A pin l3 fits into the recess andsecures the screw 55 SwiveIly tothe carriage.

At the right the carriage has a u shaped slot H for mounting the cuttingdisc I 5 secured within the slot by means of -a pin it. The constructionof the disc determines the effectiveness of the tool. A cylindrical body20 of the disc is pierced 5 by ahole 2| through which the screw I6 isinserted. On one side of the body is an annular cutting edge 22 whichprojects beyond'the circumference oi the cylinder, whose purpose it isto cut the tubing audio guide the action of the disc. Spaced from thecutting edge is a-more rounded annular grooving edge 23 also projectingfrom the cylindrical surface. I'lne projection of the circumference ofthe grooving edge from the surface of the cylindrical body 28 determinesthe maximum depth of the groove.

It will be noted that the center of the cutting disc is positionedslightly nearer the lateral opening of the open central portion 5 thanis the center of a tube inserted in the V shaped recess. 2-.)

Consequently, when the disc is .in contact with the tube there is lessspace between it and the outside of projection 8 than the inside, sothat if by chance the tube should shift in the tool it would slip inwardand the tool would not drop from a worker's hand. When it is desired togroove the end of a tube the'tube is placed in the tool as shown inFigs. 1 and. 2. The carriage is screwed in so that the cutting edge 22begins-to cut into the tube and the 30 tool then rotated around thetube, the carriage being screwed in continually deeper. After thecutting edge 22 has taken a grip and before the tube has been entirelyout through the roundedgrooving edge 23 begins to contact and tosteadily impress a groove 2i around the tube, similar to the grooveillustrated in Figs. 3 and 4. The cutting edge while performing thecutting operation thus serves simultaneously as a guide for y thegrooving operation. 40

In addition the cylindrical body 20 eventually comes into contact withthe tube as the rounded edge sinks deeper to form the groove andprevents the groove being made any deeper than the distance the groovingedge is set above the surface of the cylinder. This limiting of thedepth of the groove is important to preventing weakening of the tubeshould excessive grooving be permitted. Before the body 20 of the disccomes into contact with the tube the edge 22 has cut its way through thewall and the operation is complete as soon as the groove is finished.Having thus described my invention what I aim and seek to secure byLetters Patent is:-

A tool for working copper tubing comprising a riage mounted on the body,means-for translating the carriage along the body to and away from theholding means, a single working element mounted on the carriagecomprising a single sharp cutting edge projecting beyond the surface ofthe element at one sidethereoi', a. rounded grooving edge projectingbeyond the surface of the element a distenoe less than the projection,

body having means for holding the tubing, :5 cerof the cutting edge andspaced laterally from said cutting edge, said element being operablefrom one side only of the tool to perform a grooving operation on thetubing simultaneously with a. cutting operation carried out on said sameside only oithe tool so that both operations are performed jointly bymovement of the carriage into cutting position.

GEORGE W HAURY.

